<!--  -->
<template>
  
      

      <el-container class="home-container">
        <!-- 头部区域 -->
            <el-header>
                <div>
                    <img src="../assets/logo.png" alt="">
                    <span>后台管理系统</span>
                </div>
                <el-button type="info" @click="logout">退出</el-button>
            </el-header>

            <!-- 页面主体区域 -->
            <el-container>
                <!-- 侧边栏 -->
                <el-aside :width="isCollspace ? '64px' : '200px'" >
                    <!-- 侧边栏菜单区域 -->
                    <div class="toggle-button" @click="toggleCollapse">
                        |||
                    </div>
                    <el-menu
                    :collapse-transition="false"
                    :collapse = "isCollspace "
                    background-color="#333744"
                    text-color="#fff"
                    active-text-color="#409EFF"
                    :unique-opened="true"
                    :router="true"
                    :default-active= "activePath"
                    >
                    <!-- 一级菜单 -->
                    <el-submenu :index="item.id + ''" v-for="item in menulist" :key="item.id">
                        <!-- 一级菜单模板区 -->
                        <template slot="title">
                            <!-- 图标 -->
                        <i :class="iconsObj[item.id]"></i>
                            <!-- 文本 -->
                        <span>{{item.authName}}</span>
                        </template>
                        <!-- 二级菜单 -->
                              <!-- :index用户动态决定跳转路由 -->
                             <el-menu-item :index="'/'+item.path" v-for="item in item.children" :key="item.id" @click="saveNavState('/'+item.path)">
                                <template slot="title">
                            <!-- 图标 -->
                                    <i class="el-icon-menu"></i>
                                        <!-- 文本 -->
                                    <span>{{item.authName}}</span>
                                  </template>
                             </el-menu-item>
                        
                    </el-submenu>
                    </el-menu>
                
                </el-aside>
                <!-- 右侧内容主体 -->
                <el-main>
                    <router-view></router-view>
                </el-main>
            </el-container>


        </el-container>
    
   

</template>
   

<script>
export default {
  data () {
    return {
        //左侧菜单栏数据
        menulist: [],
        iconsObj: {
            125: 'iconfont icon-user',
            103: 'iconfont icon-tijikongjian',
            101: 'iconfont icon-shangpin',
            102: 'iconfont icon-danju',
            145: 'iconfont icon-baobiao'
        },
        isCollspace: false,
        activePath: ''
    };
  },

  //页面一挂载获取行为周期
  created() {
      this.getMenuList()
      this.activePath = window.sessionStorage.getItem('activePath')
  },

  methods: {
      //点击退出按钮清空token并返回登录页面
      logout () {
          window.sessionStorage.clear()
          this.$router.push('/login')
      },
      async getMenuList() {  
          const { data: res } =  await this.$http.get('menus')
          if(res.meta.status !== 200){
               this.$message.error('加载失败，网络超时！！！'+res.meta.msg)
          }else{
              this.menulist = res.data
          }
      },
      //点击按钮。切换菜单栏的折叠
      toggleCollapse() {
          this.isCollspace = ! this.isCollspace
      },
      //点击保存用户刷新前保存的路由，刷新后也不会重置
      saveNavState(activePath) {
          window.sessionStorage.setItem('activePath', activePath)
          this.activePath = activePath
      }
  },

  components: {},

  
}

</script>

<style  lang="less" bscoped>

    .home-container{
        height: 100%;
    }

    .el-header {
        background-color: #373D41;
        display: flex;
        justify-content: space-between;
        padding-left: 0;
        align-items: center;
        color: #fff;
        font-size: 20px;
        > div {
            display: flex;
            align-items: center;
            span {
                margin-left: 15px;
            }
            img {
                width: 50px;
            }
        }
    }
    
    .el-aside {
        background-color: #333744;
        .el-menu{
            border-right: 0;
        }
    }

    .el-main {
        background-color: #eaedf1;
    }

    .iconfont {
        margin-right: 10px;
    }
    
    .toggle-button {
        background-color: #4A5064;
        font-size: 10px;
        line-height: 24px;
        color: #fff;
        text-align: center;
        letter-spacing: 0.2em;
        cursor: pointer;
    }
</style>